package com.zbkj.admin.service.impl;

import java.security.MessageDigest;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class RequestEncoder {
    private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    public static String encode(String algorithm, String str) {
        if (str == null) {
            return null;
        }
        try {
            MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
            messageDigest.update(str.getBytes("UTF-8"));
            return getFormattedText(messageDigest.digest());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    private static String getFormattedText(byte[] bytes) {
        int len = bytes.length;
        StringBuilder buf = new StringBuilder(len * 2);
        for (int j = 0; j < len; j++) {
            buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
            buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
        }
        return buf.toString();
    }

    public static String formatRequest(Map<String, String> data) {
        Set<String> keySet = data.keySet();
        Iterator<String> it = keySet.iterator();
        StringBuffer sb = new StringBuffer();
        while (it.hasNext()) {
            String key = it.next();
            Object value = data.get(key);
            if (value instanceof String) {
                sb.append(key + "=" + value + "&");
            }
        }
        if (sb.length() != 0) {
            System.out.println("sb.substring(0, sb.length() - 1) = " + sb.substring(0, sb.length() - 1));
            return sb.substring(0, sb.length() - 1);
        }
        return null;
    }

}
